Offset-web cleaner for printing presses



Feb. 5, 19z9.

J. M. TRIER OFFSET WEB CLEANER FOR PRINTING PRESSES Filed Nov. 25, 1927 By als Affforlzgm Patented 5, 1929. 'i lgy LllilllFili Y STATES PA''ENT GFFICE.

JAMES M. TRIER, F NE'W YORK, N. Y.

OFFSET-EVER CLEANER- FGR PRINTING YBESSES.

Application :ed November 25, 19537. Serial No. 235,497.

rllhe present invention relates more partie rear edge of thecleaner frame and in the ularly to improvements in the construction rear of the cleaning blades 11 and 12. and arrangement of the cleaner set'forth and best seen in .Figure i of the drawings, claimed in latent No. 1,287,524, issued to the blade 9 is shortened so that a clearancelis 60 ine unde date of December 10, 1913, and has established between the upper edge of the among its principal objects to avoid the parblade) and the web 13. lt will. also be noted ticles being carried past the cleaner; to pro" that the bridge bars 14 with which the frame vide a i gid adjustment for the cleaner; and 10 is suppliedy are slightly bowed upwardly to simplify and strengthen the construction. or crowned so that the center of the cleaner 55 i@ Figure 1 is longitudinal vertical section higher than the front and rear edges g, diagrannnatically, the arrangement thereof to entend above a straight line drawn of printing, packing, and Jeb-winding cylbetween. the guide rollers 15 with which the inders and guide rollers connected therewith printing press is provided. The tension on as embodied in presses of conventional inalze the web 13 imposed by this construction is together with a cleaner for the web convaried by adjusting the freine 10 up and structed and arranged in accordance with down and to this end the frame y10 is prothe present invention. l vided with hanging brackets 16. The brack- Figure 2 is a top plan view of the cleaner. ets 1G are suitably mounted on the frame 17 l? i gure 3 is a cross section of the cleaner of a printing press by ineans of bolts 13 which frame showing the arrangement of the adextend through slots 19 in the brackets 16. justing means therefor, the section being It will be noted that the bolts 18 are disposed taken as on the line 3 3 in Figure 2. in staggered relation each to the other. i This Figure e is a cross section of the cleaner arrangement provides against any tendency frame showing in connection therewith a to rock the brackets 16 and the cleaner frame S0 fragment of the web, the parts being shown connected therewith.

on enlarged scale and the section being taken The cleaner franie 10 is preferably mounted as on the line l-l in Figure 2. on the brackets 16, a rivet 2O serving as the A disadvantage in the use of the cleaner pivot on which the frame inay be swung. A disclosed in the prior patent above referred bolt 21 mounted in a quadrant slot 22 is 30 to has been found to be that the ink and inkused to set the frame after it has been ading particles picked up by the web, when in justed in the proper relation to the web and contact with the printing sheet, will later acto the brackets 1G. euinulate on the cleaner blades until the aeln Figure 2 of the drawings it is ybest cuinulation encroaches upon and raises the shown that the forward cleaning blades 12 to web at the blade sufficiently to be .carried areprowed toward the front of the fraine 10` over toward the web roller. the sides falling away to produce a lateral lt has been found that the successive blades scraping effect on the web as the saine is attempt to clean the web and to arrest these drawn thereover. rlhe blades 11 are prefen particles which niay be carried by thepreably straight these blades being intended a@ ceding blade. llfhen, as heretofore, the final to serve as auxiliary or cleaning blades for blade is passed with the blade in Contact with the web after the saine has passed the blades the web, the saine effect is produced on the 12, t is to trie rear of the blades 11 that the final blade with the result that accumulated blade 9 is disposed. bits pass over the blade adhering to the blade lith an apparatus constructed and ai'- 10g to become later rolled between layers thereofV Ji'anged as herein discloscd the operation is when the web is finally rewound upon the web as follows: Y y y roll. lll/'hilfe printing on the sheet A between the nl further defect inL the operation of the type roller B and the iressure roller C, the lirevious cleaner has leen found to be tl' at web 13 is fed over from the web roller D les ce the frame has a. tendency to roch in syinpathrough the guide rollers 15 to the winding thv with the roll or run of the web incident roller E. The web 13y is eeg 3ciallyT useful tothe fact that thestress or strain on the webV where the printing is being done on both sides alternates frein side edge to side edge thereof. of the sheet A, therefore, the wet side of the lliTith these two objections in inind, the pressheet is rolled over 'the web 13 which travels i e5 ent invention principally concerns the proat the saine rate of speed without drag upon vision of a blade 9 which is mounted at the the sheet A. The roller C is thus protected 'lroin becoming smeared and dirty. llfhcn the sheet has been run through, the web 13 is immediately reiround on the Web roller D. t is at this tiine that the cleaner herein de scribed functions. As the Web is rewound it drawn over the blades l2, 1i and past the blade 9 successively and in the order nained. rl`he tension on the web 13 incident to the elevation of the traine lO and the blades thereon is such that the ink imparted to the web l by the sheet A, together with small particles el' dustor otherI material natural to the atmosphere of a Working press rooin is removed by the blades l2 and ll.

As above stated, the ink and other material thus arrested by the bladesn piles up on the blades and consetpientlj,Y crowd over. lllhen in tiinc the accumulation ol" the last oit the blades 1l acts in this way, the blade 9 not being' in contact with the ircb l); serves to kneel: the fragment hanging` to the web therefrom Without receir' ig the pressure that it would receive if it was in contact with the web. The attachment, it' any, thus imparted to the inl:- ing particle is not sui'icicnt to nic-ke it adhere to the blade S). rlhe cons-cfpience ol" such is that it 'falls through the traine i0 and is lost sight of as tar as this operation is concerned.

The result of the above described action is that the Web when reWound on the Web roll D has been denuded of the inl; and particles which otherwise would beconie embedded in the roll with the result that when the web was again used the accumulation or spot would be transferred to the sheet- A.

It Will be noted also that it in the operation of the web, or if by any inequality in the tensile strength of the paper forming the web, one or other of the side of the Web has stretched, the rigid traine with the rigid blades ll and l2 will correct the stretch of the web so that it returns to the roll D in proper condition for re-usc.

llifhat l claiin is:

1. In combination with a printing press haring an oliset web and couipn'ient relating thereto, ot a cleaner comprising a plurality et scraper blades adapted to rictionally ensaid web, and a guard blade disposed between said scraper blade and the roller i'or said web, said Lguard blade being adjacent to but out oi contact with said web.

2. ln combination with a printing@Y press having an oil'set web and equipment relating;l thereto, ot' a cleaner comprising` a plurality of serai er blades adapted to ifrictionally cng'age said web, and a guard blade disposed between said scraper blade and the roller for said web, said guard blade being adjacent to but out of contact With said web, and means for rigidly supp rting said scraper and guard lades.

AMES M. TRIER. 

